Backend Development Standards
This skill provides expert guidelines for building robust, scalable, and secure distributed systems.
Core Philosophy
- Documentation is Truth: Never guess syntax or patterns. If unsure, use
search_webto find official docs. - Security First: Every input is malicious until validated. Every endpoint needs explicit AuthN/AuthZ.
- Simplicity: Prefer boring technology that works. Complexity must be justified.
1. Dynamic Context Loading
CRITICAL STEP: Before helping the user, you MUST identify the specific technology stack.
Logic:
- Check the user's request and open files.
- Load the relevant references using
view_file.
| Detected Stack | Files to Load |
|---|---|
| Architectural / DB Design | references/general-patterns.md |
| Node.js (Express) | references/node-express.md |
| Node.js (NestJS) | references/node-nestjs.md |
| Python (Django) | references/python-django.md |
| Python (FastAPI) | references/python-fastapi.md |
| Go (Gin) | references/go-gin.md |
| Go (Echo) | references/go-echo.md |
| Java (Spring Boot) | references/java-springboot.md |
[!NOTE] If the user asks a general question (e.g., "How do I secure my API?"), load references/general-patterns.md.2. Core Responsibilities
A. API Design (Contract First)
- REST: Use clear resource naming (Plural nouns), standard status codes.
- GraphQL: Schema-first design.
- Documentation: All APIs must be documented (OpenAPI/Swagger).
B. Database Design
- Schema: 3rd Normal Form for Relational. Access-pattern driven for NoSQL.
- Indexes: Mandatory for foreign keys and query predicates.
- Migrations: Database changes must be versioned and reversible.
C. Security (Zero Trust)
- Validation: Use strict schema validation (Zod, Pydantic, Joi) at the entry point.
- Auth: JWT for stateless, Sessions for stateful. Always validate scopes/permissions.
- Secrets: NEVER hardcode secrets. Use Environment Variables.
D. Testing (Confidence)
- Unit: Test logic in isolation. Mock dependencies.
- Integration: Test DB interactions and API endpoints.
3. Collaboration with Lead Architect
CRITICAL: For high-stakes Architectural, Security, or Database Design decisions, you MUST align with the lead-architect skill.
When to consult Lead Architect References:
- System Design: Deciding between Monolith vs. Microservices.
- Complex Security: Implementing Zero Trust, complex OAuth2/OIDC flows, or Threat Modeling.
- Process: Defining CI/CD standards or DORA metrics.
Action: If the user asks for these, load the relevant lead-architect reference (e.g., .agent/skills/lead-architect/references/system-architecture.md) OR advise the user to "Consult the Lead Architect skill".
4. Interaction Rules
- Code Reviews: Be pedantic about security, performance (N+1 queries), and readability.
- Explanations: Explain *WHY* an architectural decision was made (Trade-offs).
- Unknowns: If you encounter a library or tool you don't know detailed syntax for, use
search_webimmediately.